SkLiteDL: remove freelisting, add reset() and SKLITEDL_PAGE knob.

tests/SkLiteDLTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 #include "SkLiteDL.h"
 #include "SkLiteRecorder.h"
 
-#if 0   // This test doesn't make sense when run in a threaded environment.  It tests global state.
-DEF_TEST(SkLiteDL_freelisting, r) {
-    // TODO: byte and count limit tests
-    sk_sp<SkLiteDL> sp1 = SkLiteDL::New({1,1,10,10}),
-                    sp2 = SkLiteDL::New({2,2,20,20});
-
-    SkLiteDL* p1 = sp1.get();
-    SkLiteDL* p2 = sp2.get();
-    REPORTER_ASSERT(r, p1 != p2);
-    REPORTER_ASSERT(r, p1->getBounds().left() == 1);
-    REPORTER_ASSERT(r, p2->getBounds().left() == 2);
-
-    sp2.reset();
-
-    sk_sp<SkLiteDL> sp3 = SkLiteDL::New({3,3,30,30});
-    SkLiteDL* p3 = sp3.get();
-    REPORTER_ASSERT(r, p1 != p3);
-    REPORTER_ASSERT(r, p2 == p3);
-    REPORTER_ASSERT(r, p1->getBounds().left() == 1);
-    REPORTER_ASSERT(r, p3->getBounds().left() == 3);
-
-    sp3.reset();
-    sp1.reset();
-
-    sk_sp<SkLiteDL> sp4 = SkLiteDL::New({4,4,40,40});
-    SkLiteDL* p4 = sp4.get();
-    REPORTER_ASSERT(r, p4 == p1);  // Checks that we operate in stack order.  Nice, not essential.
-    REPORTER_ASSERT(r, p4->getBounds().left() == 4);
-}
-#endif
-
 DEF_TEST(SkLiteDL_basics, r) {
     sk_sp<SkLiteDL> p { SkLiteDL::New({2,2,3,3}) };
 
     p->save();
         p->clipRect(SkRect{2,3,4,5}, SkRegion::kIntersect_Op, true);
         p->drawRect(SkRect{0,0,9,9}, SkPaint{});
     p->restore();
 }
 
 DEF_TEST(SkLiteRecorder, r) {
     sk_sp<SkLiteDL> p { SkLiteDL::New({2,2,3,3}) };
 
     SkLiteRecorder rec;
     SkCanvas* c = &rec;
 
     rec.reset(p.get());
 
     c->save();
         c->clipRect(SkRect{2,3,4,5}, SkRegion::kIntersect_Op, true);
         c->drawRect(SkRect{0,0,9,9}, SkPaint{});
     c->restore();
 }